\begin{tikzpicture}[gnuplot]
%% generated with GNUPLOT 5.4p8 (Lua 5.3; terminal rev. Jun 2020, script rev. 118)
%% Mon Nov  6 17:32:44 2023
\path (0.000,0.000) rectangle (12.500,8.750);
\gpcolor{color=gp lt color border}
\gpsetlinetype{gp lt border}
\gpsetdashtype{gp dt solid}
\gpsetlinewidth{1.00}
\draw[gp path] (1.504,0.985)--(1.684,0.985);
\node[gp node right] at (1.320,0.985) {$0.9$};
\draw[gp path] (1.504,2.849)--(1.684,2.849);
\node[gp node right] at (1.320,2.849) {$0.95$};
\draw[gp path] (1.504,4.713)--(1.684,4.713);
\node[gp node right] at (1.320,4.713) {$1$};
\draw[gp path] (1.504,6.577)--(1.684,6.577);
\node[gp node right] at (1.320,6.577) {$1.05$};
\draw[gp path] (1.504,8.441)--(1.684,8.441);
\node[gp node right] at (1.320,8.441) {$1.1$};
\draw[gp path] (1.504,0.985)--(1.504,1.165);
\node[gp node center] at (1.504,0.677) {$0$};
\draw[gp path] (2.715,0.985)--(2.715,1.165);
\node[gp node center] at (2.715,0.677) {$10000$};
\draw[gp path] (3.927,0.985)--(3.927,1.165);
\node[gp node center] at (3.927,0.677) {$20000$};
\draw[gp path] (5.138,0.985)--(5.138,1.165);
\node[gp node center] at (5.138,0.677) {$30000$};
\draw[gp path] (6.350,0.985)--(6.350,1.165);
\node[gp node center] at (6.350,0.677) {$40000$};
\draw[gp path] (7.561,0.985)--(7.561,1.165);
\node[gp node center] at (7.561,0.677) {$50000$};
\draw[gp path] (8.773,0.985)--(8.773,1.165);
\node[gp node center] at (8.773,0.677) {$60000$};
\draw[gp path] (9.984,0.985)--(9.984,1.165);
\node[gp node center] at (9.984,0.677) {$70000$};
\draw[gp path] (11.196,0.985)--(11.196,1.165);
\node[gp node center] at (11.196,0.677) {$80000$};
\draw[gp path] (1.504,8.441)--(1.504,0.985)--(11.947,0.985);
\node[gp node center,rotate=-270] at (0.108,4.713) {\(V\) (p.u.)};
\node[gp node center] at (6.725,0.215) {Time (sec)};
\node[gp node right] at (8.574,8.287) {\(V_{50}\)};
\gpcolor{rgb color={0.580,0.000,0.827}}
\draw[gp path] (8.758,8.287)--(9.674,8.287);
\draw[gp path] (1.575,0.985)--(1.577,1.473)--(1.649,1.473)--(1.722,1.473)--(1.795,1.473)%
  --(1.867,1.473)--(1.940,1.473)--(2.013,1.473)--(2.086,1.473)--(2.158,1.473)--(2.231,1.473)%
  --(2.304,1.873)--(2.376,1.873)--(2.449,2.147)--(2.522,2.147)--(2.594,2.260)--(2.667,2.260)%
  --(2.740,2.256)--(2.812,2.256)--(2.885,2.277)--(2.958,2.276)--(3.030,2.272)--(3.103,2.265)%
  --(3.176,2.286)--(3.249,2.342)--(3.321,2.307)--(3.394,2.269)--(3.467,2.246)--(3.539,2.224)%
  --(3.612,2.224)--(3.685,1.630)--(3.757,1.649)--(3.830,1.649)--(3.903,1.270)--(3.975,1.270)%
  --(4.048,1.211)--(4.121,1.244)--(4.141,0.985);
\draw[gp path] (10.837,0.985)--(10.881,1.338)--(10.954,1.337)--(11.026,1.337)--(11.099,1.337)%
  --(11.172,1.677)--(11.244,1.615)--(11.317,1.612)--(11.390,1.616)--(11.462,1.620)--(11.535,1.621)%
  --(11.608,1.621)--(11.680,1.538)--(11.753,1.538)--(11.826,1.503)--(11.899,1.603)--(11.947,1.605);
\gpcolor{color=gp lt color border}
\draw[gp path] (1.504,8.441)--(1.504,0.985)--(11.947,0.985);
%% coordinates of the plot area
\gpdefrectangularnode{gp plot 1}{\pgfpoint{1.504cm}{0.985cm}}{\pgfpoint{11.947cm}{8.441cm}}
\end{tikzpicture}
%% gnuplot variables
